Solder paste column M705, flux, board washing drinking water with complete Liquor; board washing water is utilised to clean up the solder residue right after repair; thermal gel (specification: Fujipoly SPG-30B) is accustomed to smear the surface on the chip following repair ；ball-planting steel mesh, solder absorption wire, solder ball (the ball diameter is recommended being 0.
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In accordance with this method, discover the chip that still has the long-tem working failure immediately after a particular chip is short circuited. Commonly, it really is a result of a specific chip damaging, so just change it; Figure 5-19 7. Phenomenon: PT1 chip check is Okay, PT2 purpose take a look at always reviews a certain chip NG.
The voltage of every voltage domain is about 1.35V. If there is a 14V powering, there is generally a site voltage, plus the output of the ability terminal with the hash board is measured very first; if there is a 14V powering but no area voltage, continue to examine down.
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four. Make the SD card In keeping with the requirements, double-sided heat sink, 8 situations Parrer test, you might want to make the SD card as shown in the figure under:
In the event the EEPROM NG is shown around the LCD display screen on the hash board tester, Examine if the welding of U5 is ordinary.
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In the event the PIC sensor NG is displayed on the Liquid crystal display screen of the hash board tester and the exam examine temperature is irregular, then Stick to the subsequent steps to troubleshoot The problem.
three. The examination SD card will likely be made In keeping with the necessities, and also the double-sided heat sink 8-times Patter test has to make an SD card, as demonstrated inside the figure underneath;
3. The SD tests card are going to be designed As outlined by the requirements, and the double-sided heat sink eight-moments Pattern take a look at should make an SD card, as demonstrated within the determine below;
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